Active Galactic Nuclei and their role in Galaxy Formation and Evolution (2009)
Kraemer, Steve, Windhorst, Rogier, Carpenter, Kenneth G., Crenshaw, Mike, Elvis, Martin, Karovska, Margarita
There are several key open questions as to the nature and origin of AGN including: 1) what initiates the active phase, 2) the duration of the active phase, and 3) the effect of the AGN on the host...
Carpenter, Kenneth G., Karovska, Margarita, Schrijver, Carolus J., Grady, Carol A., Allen, Ronald J., Brown, Alexander, ...
We summarize some of the compelling new scientific opportunities for understanding stars and stellar systems that can be enabled by sub-mas angular resolution, UV/Optical spectral imaging...
Long-Period Variability in o Ceti (2009)
Templeton, Matthew R., Karovska, Margarita
We carried out a new and sensitive search for long-period variability in the prototype of the Mira class of long-period pulsating variables, o Ceti (Mira A), the closest and brightest Mira variable....
Quantifying Stellar Mass Loss with High Angular Resolution Imaging (2009)
Ridgway, Stephen, Aufdenberg, Jason, Creech-Eakman, Michelle, Elias, Nicholas, Howell, Steve, Hutter, Don, ...
Mass is constantly being recycled in the universe. One of the most powerful recycling paths is via stellar mass-loss. All stars exhibit mass loss with rates ranging from ~10(-14) to 10(-4) M(sun)...
Science, Instrumentation, and Methods (2008)
Alanna Connors, David N. Esch, Peter Freeman, Hosung Kang, Margarita Karovska, ...
Conjugate Analysis of the Conway-Maxwell-Poisson Distribution.. Kadane et. al 363 Misinformation in the conjugate prior for the linear model with implications for free-knot spline...
The Structure of Active Merger Remnant NGC 6240 from IRAC Observations (2008)
Bush, Stephanie J., Wang, Zhong, Karovska, Margarita, Fazio, Giovanni G.
NGC 6240 is a rare object in the local universe: an active merger remnant viewed at the point of merging where two active galactic nuclei are visible. We present IRAC data of this object, providing...
Direct Detection of the Close Companion of Polaris with the Hubble Space Telescope (2008)
Evans, Nancy Remage, Schaefer, Gail H., Bond, Howard E., Bono, Giuseppe, Karovska, Margarita, Nelan, Edmund, ...
Polaris, the nearest and brightest classical Cepheid, is a single-lined spectroscopic binary with an orbital period of 30 years. Using the High Resolution Channel of the Advanced Camera for Surveys...
The Near-Infrared Broad Emission Line Region of Active Galactic Nuclei -- I. The Observations (2007)
Landt, Hermine, Bentz, Misty C., Ward, Martin J., Elvis, Martin, Peterson, Bradley M., Korista, Kirk T., ...
We present high quality (high signal-to-noise ratio and moderate spectral resolution) near-infrared (near-IR) spectroscopic observations of 23 well-known broad-emission line active galactic nuclei...
Cepheids in Multiple Systems: ADS 14859 (2007)
Evans, Nancy R., Franz, Otto, Massa, Derck, Mason, Brian, Walker, Richard L., Karovska, Margarita
We have attempted to resolve the system containing the Cepheid V1334 Cyg (= ADS 14859) using both the Faint Object Camera (FOC) and the Fine Guidance Sensor (FGS) on the Hubble Space Telescope, and...
Chandra multiwavelength project X-ray point source catalog (2007)
Kim, Minsun, Kim, Dong-Woo, Wilkes, Belinda J., Green, Paul J., Kim, Eunhyeuk, Anderson, Craig S., ...
Chandra Multiwavelength Project X-ray Point Source Catalog (2006)
Kim, Minsun, Kim, Dong-Woo, Wilkes, Belinda J., Green, Paul J., Kim, Eunhyeuk, Anderson, Craig S., ...
We present the Chandra Multiwavelength Project (ChaMP) X-ray point source catalog with ~6,800 X-ray sources detected in 149 Chandra observations covering \~10 deg^2. The full ChaMP catalog sample is...
Polaris: Mass and Multiplicity (2006)
Evans, Nancy Remage, Schaefer, Gail, Bond, Howard E., Nelan, Edmund, Bono, Giuseppe, Karovska, Margarita, ...
Polaris, the nearest and brightest classical Cepheid, is a member of at least a triple system. It has a wide ($18''$) physical companion, the F-type dwarf Polaris B. Polaris itself is a single-lined...
Wood, Brian E., Karovska, Margarita
Recent ultraviolet spectra from the Hubble Space Telescope (HST) and Far Ultraviolet Spectroscopic Explorer (FUSE) satellites demonstrate that UV line and continuum fluxes observed from Mira B are...
The Stellar Imager (SI) Vision Mission (2006)
Carpenter, Kenneth G., Schrijver, Carolus J., Karovska, Margarita, Team, SI Vision Mission
The Stellar Imager (SI) is a UV-Optical, Space-Based Interferometer designed to enable 0.1 milli-arcsecond (mas) spectral imaging of stellar surfaces and of the Universe in general and asteroseismic...
Minsun Kim, Dong-woo Kim, Belinda J. Wilkes, Paul J. Green, Eunhyeuk Kim, Craig S. Anderson, ...
We present the Chandra Multiwavelength Project (ChaMP) X-ray point source catalog with 6800 X-ray sources detected in 149 Chandra observations covering 10 deg 2. The full ChaMP catalog sample is 7...
First Resolved Images of the Mira AB Symbiotic Binary at Centimeter Wavelengths (2005)
Matthews, Lynn D., Karovska, Margarita
We report the first spatially resolved radio continuum measurements of the Mira AB symbiotic binary system, based on observations obtained with the Very Large Array (VLA). This is the first time that...
An Error Analysis of the Geometric Baade-Wesselink Method (2003)
Marengo, Massimo, Karovska, Margarita, Sasselov, Dimitar D., Sanchez, Mayly
We derive an analytic solution for the minimization problem in the geometric Baade-Wesselink method. This solution allows deriving the distance and mean radius of a pulsating star by fitting its...
Quasar Winds as Dust Factories at High Redshift (2003)
Elvis, Martin, Marengo, Massimo, Karovska, Margarita
Winds from AGN and quasars will form large amounts of dust, as the cool gas in these winds passes through the (pressure, temperature) region where dust is formed in AGB stars. Conditions in the gas...
Spatially Resolved Circumnuclear Dust in Centaurus A (2003)
Karovska, Margarita, Marengo, Massimo, Elvis, Martin, Fazio, Giovanni, Hora, Joseph, Hinz, Philip, ...
In this paper we present results from our exploratory mid-IR study of Centaurus A circumnuclear environment using high-angular resolution imaging at the Magellan 6.5m telescope with the MIRAC/BLINC...
Wood, Brian E., Karovska, Margarita
We present new Far Ultraviolet Spectroscopic Explorer (FUSE) observations of Mira A's wind-accreting companion star, Mira B. We find that the strongest lines in the FUSE spectrum are H2 lines...
Marengo, Massimo, Karovska, Margarita, Sasselov, Dimitar D., Armstrong, John T., Nordgren, Tyler E.
The geometric Baade-Wesselink method is one of the most promising techniques for obtaining a better calibration of the Cepheid period-luminosity relation by means of interferometric measurements of...
Distances on Cosmological Scales with VLTI (2003)
Karovska, Margarita, Elvis, Martin, Marengo, Massimo
We present here a new method using interferometric measurements of quasars, that allows the determination of direct geometrical distances on cosmic scales. Quasar Broad Emission Line Regions sizes...
Cepheid Limb Darkening Models for the VLTI (2003)
Marengo, Massimo, Karovska, Margarita, Sasselov, Dimitar D., Papaliolios, Costas, Armstrong, J. T., Nordgren, Tyler
We present a new method to compute wavelength- and phase-dependent limb darkening corrections for classical Cepheids. These corrections are derived from hydrodynamic simulations and radiative...
Quasar Parallax: a Method for Determining Direct Geometrical Distances to Quasars (2002)
Elvis, Martin, Karovska, Margarita
We describe a novel method to determine direct geometrical distances to quasars that can measure the cosmological constant, Lambda, with minimal assumptions. This method is equivalent to geometric...
Analysis of H2 Emission from Mira B in UV Spectra from HST (2002)
Wood, Brian E., Karovska, Margarita, Raymond, John C.
We analyze Ly-alpha fluoresced H2 lines observed in the UV spectrum of Mira B. We identify 13 different sequences fluoresced by 13 different H2 transitions within the Ly-alpha line. The observed H2...
An IR view of mass loss in Long Period Variables (2002)
Marengo, Massimo, Karovska, Margarita, Ivezic, Zeljko
We have investigated the mass loss processes in Long Period Variables, by combining radiative transfer modeling with mid-IR imaging and spectroscopic observations. We find a correlation between...
Smoking Quasars: a New Source for Cosmic Dust (2002)
Elvis, Martin, Marengo, Massimo, Karovska, Margarita
Although dust is widely found in astrophysics, forming dust is surprisingly difficult. The proper combination of low temperature (
Detection of H2 Emission from Mira B in UV Spectra from the Hubble Space Telescope (2001)
Wood, Brian E., Karovska, Margarita, Hack, Warren
We present ultraviolet spectra of Mira's companion star from the Space Telescope Imaging Spectrograph (STIS) instrument on board the Hubble Space Telescope (HST). The companion is generally assumed...
Mid-IR Observations of Mira Circumstellar Environment (2001)
Marengo, Massimo, Karovska, Margarita, Fazio, Giovanni G., Hora, Joseph L., Hoffmann, William F., Dayal, Aditya, ...
This paper presents results from high-angular resolution mid-IR imaging of the Mira AB circumbinary environment using the MIRAC3 camera at the NASA Infrared Telescope Facility (IRTF). We resolved the...
Interpreting the Mg II h and k Line Profiles of Mira Variables (2000)
Wood, Brian E., Karovska, Margarita
We use radiative transfer calculations to reproduce the basic appearance of Mg II lines observed from Mira variables. These lines have centroids that are blueshifted by at least 30 km/s from the...
Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula (2000)
Weisskopf, Martin C., Hester, J. Jeff, Tennant, Allyn F., Elsner, Ronald F., Schulz, Norbert S., Marshall, Herman L., ...
The Chandra X-ray Observatory observed the Crab Nebula and Pulsar during orbital calibration. Zeroth-order images with the High-Energy Transmission Grating (HETG) read-out by the Advanced CCD Imaging...
Studying the Pulsation of Mira Variables in the Ultraviolet (2000)
Wood, Brian E., Karovska, Margarita
We present results from an empirical study of the Mg II h & k emission lines of selected Mira variable stars, using spectra from the International Ultraviolet Explorer (IUE). The stars all exhibit...
Enhancement of LASCO C1, C2 and C3 Coronargraph Images (1998)
Karovska, Margarita, Wood, Brian
The Large Angle Spectrometric Coronagraph (LASCO) onboard SOHO provides unprecedented views of the solar corona since January 1996. During the past year we carried out a study of the morphology and...
Enhancement of Lasco C1, C2, and C3 Coronagraph Images (1998)
The Large Angle Spectrometric Coronagraph (LASCO) on board SOHO provided unprecedented views of the solar corona since January 1996. This instrument contains three individual coronagraphs C1, C2, and...